{
  "circularId": 34567,
  "subject": "GRB 230826A: Mondy optical observations",
  "eventId": "GRB 230826A",
  "createdOn": 1693099718139,
  "submitter": "Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>",
  "submittedHow": "email-legacy",
  "bibcode": "2023GCN.34567....1P",
  "body": "N. Pankov (HSE, IKI), E. Klunko (ISTP), A. Pozanenko (IKI), S. Belkin (IKI) on behalf of GRB-IKI-FuN report.\n\nWe observed the field of GRB 230826A detected by Fermi GBM (Fermi GBM Team, GCN 34564) and Swift (Eyles-Ferris et al, 34565) with AZT-33IK telescope of Sayan observatory (Mondy).  Observations started on 2023-08-26 220:06:00  (UT) (i.e. ~33 min since trigger). We obtained  \nseries of images in R-filter. We do not detect evident candidate within XRT error  circle (Swift-XRT Position: +05h 32m 14.20s +66d 07' 30.0\" 5.3 arcsec, radius) in a stacked image.  Preliminary photometry is following:\n\nDate       UT start   t-T0    Filter Exp.    OT   Err.  UL(3sigma)\n                       (mid, days)    (s)\n\n2023-08-26 20:06:00   0.038345  R     44*60  n/d  n/d   22.0\n\nWe note the presence of the object USNO-B1.0 1561-0095652 at 8.8 arces from the Swift-XRT Position. Measured brightness of the object is R = 18.1 +/- 0.01 what is brighter than USNO-B1.0 R2=18.22 magnitude.\n\nAll photometry is based on nearby USNO-B1.0 stars, R2 magnitudes\n\n"
}